Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80C and leaves at 50C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20C. The log mean temperature difference in C is approximately ?
A. 32

B. 45

C. 50

D. 37

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